The mentor is person/object that comes from the new world to
which the hero is being called. The function of the mentor is to help ease the
fear of the hero that made him/her refuse the call in the first place. This
could be through giving the hero knowledge of the new world to combat a fear of
the unknown, giving the hero confidence to overcome feelings of inadequacy, or
giving them hope that they can survive the trials by serving as an example.